No global settings in `libnixfetchers` and `libnixflake` #11035

Job	Run time
Check Cachix and Docker secrets present for installer tests	1s
vm_tests	22m 20s
meson_build (ubuntu-latest)	9m 20s
meson_build (macos-latest)	4m 38s
tests (ubuntu-latest)	29m 23s
tests (macos-latest)	20m 33s
installer	0s
docker_push_image	0s
installer_test	0s
	1h 26m 15s

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